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/*
* SPDX-FileCopyrightText: 2016 Mathieu Stefani
*
* SPDX-License-Identifier: Apache-2.0
*/
/*
Mathieu Stefani, 07 février 2016
Example of a REST endpoint with routing
*/
#include <algorithm>
#include <pistache/endpoint.h>
#include <pistache/http.h>
#include <pistache/router.h>
using namespace Pistache;
void printCookies(const Http::Request& req)
{
auto cookies = req.cookies();
std::cout << "Cookies: [" << std::endl;
const std::string indent(4, ' ');
for (const auto& c : cookies)
{
std::cout << indent << c.name << " = " << c.value << std::endl;
}
std::cout << "]" << std::endl;
}
namespace Generic
{
void handleReady(const Rest::Request&, Http::ResponseWriter response)
{
response.send(Http::Code::Ok, "1");
}
}
class StatsEndpoint
{
public:
explicit StatsEndpoint(Address addr)
: httpEndpoint(std::make_shared<Http::Endpoint>(addr))
{ }
void init(size_t thr = 2)
{
auto opts = Http::Endpoint::options()
.threads(static_cast<int>(thr));
httpEndpoint->init(opts);
setupRoutes();
}
void start()
{
httpEndpoint->setHandler(router.handler());
httpEndpoint->serve();
}
private:
void setupRoutes()
{
using namespace Rest;
Routes::Post(router, "/record/:name/:value?", Routes::bind(&StatsEndpoint::doRecordMetric, this));
Routes::Get(router, "/value/:name", Routes::bind(&StatsEndpoint::doGetMetric, this));
Routes::Get(router, "/ready", Routes::bind(&Generic::handleReady));
Routes::Get(router, "/auth", Routes::bind(&StatsEndpoint::doAuth, this));
}
void doRecordMetric(const Rest::Request& request, Http::ResponseWriter response)
{
auto name = request.param(":name").as<std::string>();
Guard guard(metricsLock);
auto it = std::find_if(metrics.begin(), metrics.end(), [&](const Metric& metric) {
return metric.name() == name;
});
int val = 1;
if (request.hasParam(":value"))
{
auto value = request.param(":value");
val = value.as<int>();
}
if (it == std::end(metrics))
{
metrics.emplace_back(std::move(name), val);
response.send(Http::Code::Created, std::to_string(val));
}
else
{
auto& metric = *it;
metric.incr(val);
response.send(Http::Code::Ok, std::to_string(metric.value()));
}
}
void doGetMetric(const Rest::Request& request, Http::ResponseWriter response)
{
auto name = request.param(":name").as<std::string>();
Guard guard(metricsLock);
auto it = std::find_if(metrics.begin(), metrics.end(), [&](const Metric& metric) {
return metric.name() == name;
});
if (it == std::end(metrics))
{
response.send(Http::Code::Not_Found, "Metric does not exist");
}
else
{
const auto& metric = *it;
response.send(Http::Code::Ok, std::to_string(metric.value()));
}
}
void doAuth(const Rest::Request& request, Http::ResponseWriter response)
{
printCookies(request);
response.cookies()
.add(Http::Cookie("lang", "en-US"));
response.send(Http::Code::Ok);
}
class Metric
{
public:
explicit Metric(std::string name, int initialValue = 1)
: name_(std::move(name))
, value_(initialValue)
{ }
int incr(int n = 1)
{
int old = value_;
value_ += n;
return old;
}
int value() const
{
return value_;
}
const std::string& name() const
{
return name_;
}
private:
std::string name_;
int value_;
};
using Lock = std::mutex;
using Guard = std::lock_guard<Lock>;
Lock metricsLock;
std::vector<Metric> metrics;
std::shared_ptr<Http::Endpoint> httpEndpoint;
Rest::Router router;
};
int main(int argc, char* argv[])
{
Port port(9080);
int thr = 2;
if (argc >= 2)
{
port = static_cast<uint16_t>(std::stol(argv[1]));
if (argc == 3)
thr = std::stoi(argv[2]);
}
Address addr(Ipv4::any(), port);
std::cout << "Cores = " << hardware_concurrency() << std::endl;
std::cout << "Using " << thr << " threads" << std::endl;
StatsEndpoint stats(addr);
stats.init(thr);
stats.start();
}
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